it is great tool, which i really want to try and do POCs for our client requirement, and we are trying to install this tool on our machines, which are under firewall, i have requested to open github ports, to have frequent access from my machine, i have installed all prerequisite softwares as said in the link
later, when i run npm install , i am getting below error.
npm ERR! fetch failed https://registry.npmjs.org/bower/-/bower-1.6.5.tgz
npm WARN retry will retry, error on last attempt: Error: getaddrinfo EAI_AGAIN registry.npmjs.org:443
need directions on, how to install tool, for developers.